The World Values Survey is a global research project that explores people’s values and beliefs, how they change over time. The WVS in collaboration with EVS (European Values Study) carried out representative national surveys in more than 100 countries containing almost 90 percent of the world's population. It is conducted in waves, the first of which was conducted in 1981. The site offers downloads of files and related documentation by wave, in integrated cumulative files, and via an online analysis tool.